Surface Characterization and Tribological Behavior of Graphene-Reinforced Cellulose Composites Prepared by Large-Area Spray Coating on Flexible Substrate

Abstract

A large-area spray coating process is introduced to efficiently apply a graphene/Cu/cellulose composite on a flexible glass substrate. The dispersion characteristics of nano-additives are measured and the Tyndall effect observed. The characteristics of the composite coating such as the film thickness, surface roughness, water contact angle, and lubricating characteristics are measured. The tribological properties of the composite coating are measured using a ball-on-disk. The wear width of the abrasive parts, as well as the wear and friction coefficient of the grinding balls, are investigated. Adding graphene/Cu helps to improve the anti-wear ability of cellulose. The transfer layer was observed using the Raman spectroscopy and mapping technology. Finally, the lubricating mechanism is discussed, and the wear mechanism is proposed. Nanoparticles existed in the wear track as the third-body particles and improved the load capacity of the composites. The wear mechanism of the composites is discussed in terms of the worn surfaces and the analysis of the transfer film with the third-body approach.

Preparation and characterization of nanocellulose coating modified by titanium dioxide

“…Compared with neat cellulose film, the CGN films rendered significant enhancement in the mechanical and thermal properties. Shi et al (2020) prepared nano-graphene/copper/ cellulose composite coatings (NGCC) on flexible glass substrates by a spraying process. The tribological performance test of the NGCC indicated that adding a small amount of graphene/Cu improves the anti-wear property of cellulose.…”

Low-Temperature Large-Area Zinc Oxide Coating Prepared by Atmospheric Microplasma-Assisted Ultrasonic Spray Pyrolysis

“…The use of biodegradable or environmentally friendly materials and their composites as friction-reducing and anti-wear materials has continued to increase in recent years owing to environmental protection imperatives [23][24][25][26]. Moreover, the wear properties of these materials change with additives [27][28][29].…”

“…In addition to optoelectronics, ZnO film is often used as an anti-wear additive, such as in anti-wear coatings [30] and anti-wear additives in lubricating oils [31]. Furthermore, ZnO is often used with other materials, such as for abrasion and lubrication with graphene composite materials [25] and graphene/ZnO as a hybrid anti-wear additive [23,32].…”